From the Foster Coach Sales Facebook page:

Brand new custom Horton conversion on a Ford F550 chassis.
Ford F550 Horton Type I ambulance

Foster Coach Sales photo

Ford F550 Horton Type I ambulance

Foster Coach Sales photo

Ford F550 Horton Type I ambulance

Foster Coach Sales photo

Mundelein Fire Department ambulance

Foster Coach Sales photo

Mundelein Fire Department ambulance

Foster Coach Sales photo